EP 0720195 A1 19960703 - Direct heating cathode and process for producing such
Title (en)
Direct heating cathode and process for producing such
Title (de)
Direkt geheizte Kathode und Verfahren zu ihrer Herstellung
Title (fr)
Cathode à chauffage direct et son procédé de fabrication
Publication
Application
Priority
KR 19940038126 A 19941228
Abstract (en)
A direct heating cathode for electron guns and a process for producing such a cathode are disclosed. The above direct heating cathode achieves a high current density, extends the expected life span and simplifies the cathode producing process. In the preferred process for producing the above cathode, powdered iridium (Ir) as a basic ingredient is mixed with powdered cerium (Ce) as a subsidiary ingredient at a given mixing ratio into a powdered metal mixture. The powdered metal mixture is subjected to mechanical impact through high energy ball milling, thereby being mechanically alloyed into alloy powder. The alloy powder is compressed to form an alloy pellet. The alloy pellet in turn is heated to remove residual gases from the pellet. Thereafter, the electron emitting performance of the pellet is tested.
IPC 1-7
IPC 8 full level
H01J 1/15 (2006.01); C22C 1/04 (2006.01); H01J 1/14 (2006.01); H01J 1/28 (2006.01); H01J 9/02 (2006.01); H01J 9/04 (2006.01)
CPC (source: EP KR US)
B22F 1/09 (2022.01 - EP KR US); B22F 9/04 (2013.01 - EP US); C22C 1/0466 (2013.01 - EP US); H01J 1/28 (2013.01 - EP US); H01J 9/04 (2013.01 - KR); H01J 9/047 (2013.01 - EP US)
Citation (search report)
- [Y] US 3877930 A 19750415 - VOLIN TIMOTHY EARL
- [Y] GB 1591789 A 19810624 - EMI VARIAN LTD
- [A] EP 0143222 A1 19850605 - BBC BROWN BOVERI & CIE [CH]
- [A] DE 4026298 A1 19920227 - SIEMENS AG [DE]
- [A] US 1689338 A 19281030 - HARRIS JAMES E
- [A] FR 1460373 A 19661125 - NAT RES DEV
- [A] S.YE. ROZHKOV ET AL.: "the work function of alloys of iridium with lanthanum,cerium,praesodymium,neodymium, and samarium", RADIO ENGINEERING AND ELECTRONIC PHYSICS, vol. 14, no. 5, pages 819
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
EP 0720195 A1 19960703; CN 1052105 C 20000503; CN 1132402 A 19961002; HU 220471 B1 20020228; HU 9503761 D0 19960228; HU T74343 A 19961230; JP 2818566 B2 19981030; JP H08255564 A 19961001; KR 100338035 B1 20021123; KR 960025916 A 19960720; MY 112496 A 20010630; RU 2104600 C1 19980210; RU 2160942 C2 20001220; TW 301008 B 19970321; US 5773922 A 19980630
DOCDB simple family (application)
EP 95309385 A 19951221; CN 95120217 A 19951204; HU 9503761 A 19951222; JP 31539295 A 19951204; KR 19940038126 A 19941228; MY PI19954145 A 19951228; RU 95122476 A 19951227; RU 96121013 A 19951227; TW 84111808 A 19951107; US 56554595 A 19951130